Top left panel: velocity dispersion map for NGC 5257. Bottom left panel: residual velocities map of NGC 5257. Top right panel: velocity dispersion map for NGC 5258. Bottom right panel: residual velocities map of NGC 5258. The bold dark line is the PA and the fainter black lines the angular sector used to compute the RC of each galaxy. Ellipses indicate the location of the bifurcation radius, Rbif, in the rotation curve of NGC 5257 and NGC 5258, respectively, discussed in Sect. 4.3.
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